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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/105841] [12 Regression] Change in behavior of CTAD for
 alias templates
Date: Wed, 24 Apr 2024 21:41:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105841

--- Comment #16 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Haojian Wu from comment #15)
> Hi, I notice that the __is_deducible was hidden in the commit
> https://github.com/gcc-mirror/gcc/commit/
> 30556bf81f4385c2a9c449948865dbcf35664764.
>=20
> Is there any reason behind the change?
>=20
> (Context: I'm implementing the is_deducible part for alias CTAD in clang,
> and I'm considering to add a similar builtin in clang).
IIRC we didn't want to commit to an API for the built-in, and we also didn't
have any motivating use cases for the it within libstdc++.=